Either way we need a simple CSS technique to introduce this sort of overlay.Since I prefer not to introduce new markup for an embelishment, we'll use the CSS In a banner, all we really want is the banner's container and any content that banner needs to contain.In this example, we'll just utilize a section container and an A little CSS magic is happening here for the added height of the banner as well as the centering of the text. 在看一个文件的时候，发现有&::before 和 &::after, 没有理解怎么用的，因为以前在项目的css文件中，从来没有使用过，也没有见过. This is one of my favorite uses of If you want to play with the code in this tutorial, the CodePens are embedded below:// Makes the overlay smaller to accommodate the skew// Push the element 50% of the container's width to the right// Moves the element 50% of its width back to the left One important note, all pseudo-elements require a content CSS property to display. The double colon has always seemed like a waste of a keystroke to me.I have a CSS linter that requires (or automates) them to be single-colon. Can anyone give a reason?We should write it as double-colon because this is the correct one – if we need to support single-colon then it should be added using for example autoprefixer (serious question – is autoprefixer support adding single-colon to browsers that don’t support double-colon version?) Unless if it is some sort of dynamic content, the user can’t change what the first-child element is.Doble colon is technically the right way, however I would normally use single colon to try to extend support. Why make things harder than they have to be?According to Mozilla “Punctuation that precedes or immediately follows the first letter is included in the match. The Senior Citizens' Savings Scheme (SCSS) is meant for Indian citizens who are 60 years of age or more. The distinction between a pseudo-element and pseudo-selector is already confusing. Sometimes this darkens the background image enough for readability. This comment thread is closed. By apply ::before or ::after to an element, you can insert a dynamic element into the DOM before or after the selected elements children. If you’re adding IE8 support, it’s best to use the single : instead. Similar to you, Chris, I made the conclusion that if the browser needs to “add stuff” in order to render the styles, it’s a pseudo-element (browser needs to “wrap the first letter in something” so we can apply I’ve advocated for a while that we should use the spec, but until doing that video, I didn’t have a valid definition of how the pseudos differ.I had browser compatibility issues when I used the double colon ::before, since then I never used it with double colon.I’m not confused about the distinction, just confused as to why the distinction is necessary.
Not that I’m actively trying to support IE8, but will not hurt.As a sidenote, the distinction between pseudo-elements and pseudo-classes is crystal clear in most cases, but some are more complicated.
The deposit matures after 5 years from the date of account opening but can be extended once by an additional 3 years. Since this is an absolutely positioned item, we'll center it with a simple CSS trick.This itself is a fun take on this design pattern, but we're going to move it one more step.This will handle the creation, positioning, and base styles for the element.Then, we override the specific pieces we need to override. Fortunately, I’ve heard people say that they have a CSS linter that requires (or automates) them to be single-colon. Umm… your analogy works for the most part but what about That isn’t really a state based selector. It is a five-year deposit scheme, which pays interest on a quarterly basis.
To fix this, your overlay and your content will need to have a I've been toying with background blend modes for a little while now, but it blew me away when I discovered The support for various blend modes are pretty weak in the Microsoft browsers, but you can still use them today with clever progressive enhancement.
If you want them to be built in Edge, you can This way in browsers that don't support blend modes, we get our average, but nice overlay and in browsers that do, we get some really neat effects on our banner.So, we have a full width overlay. ::before is definitely a pseudo-element, so it should use the double colon. This is often a nightmare for readability and accessibility.This means we want to introduce an overlay to sit between the image and the text. Punctuation includes any Unicode character defined in the open (Ps), close (Pe), initial quote (Pi), final quote (Pf), and other punctuation (Po) classes.” (This is a classic example where it seems there’s a clearly-correct way to write it (::before, for spec correctness / future-thinking) and deploy it (:before, support and that precious char count), and they’re opposing.Build tools & deployment processes make it easy to flip a switch when CSS8 finally deprecates single-colon syntax :)Pseudo-classes can change based on a user action (or interaction). The background isn't centered! Our friendly overlay is covering not just the background image, but also the text in the banner.By using absolute positioning, we've actually put the overlay on top of the stacking context of our banner. Personally, I’m OK with people doing that. Why not drop double colon and put an end to the confusion?I agree! – the same situation that happens with gradients – we have three syntaxes but we should use only one (correct) – new and let autoprefixer add tweener and old syntaxes when needed.Even if it did, you would explicitly have to declare in your config that you want to support IE8 in order for it to be included in your output CSS.Can’t you look at it like this: you have the pseudo-element Aren’t they both called pseudo-selectors? The single-colon syntax was used for both pseudo-classes and pseudo-elements in CSS2 and CSS1. Seems fine.
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